spacewander commented on code in PR #8099:
URL: https://github.com/apache/apisix/pull/8099#discussion_r1002703235
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apisix/plugins/zipkin/codec.lua:
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@@ -97,11 +97,13 @@ local function new_injector()
headers["x-b3-parentspanid"] = span_context.parent_id
and to_hex(span_context.parent_id) or nil
headers["x-b3-spanid"] = to_hex(span_context.span_id)
- -- when we call this function, we already start to sample
- headers["x-b3-sampled"] = "1"
+ headers["x-b3-sampled"] = span_context:get_baggage_item("x-b3-sampled")
for key, value in span_context:each_baggage_item() do
- -- XXX: https://github.com/opentracing/specification/issues/117
- headers["uberctx-"..key] = ngx.escape_uri(value)
+ -- skip x-b3-sampled baggage
+ if key ~= "x-b3-sampled" then
+ -- XXX: https://github.com/opentracing/specification/issues/117
+ headers["uberctx-"..key] = ngx.escape_uri(value)
Review Comment:
Why does the uberctx depend on "x-b3-sampled"?
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